TELO, another political party representing the Tamil National Alliane, pledged support to NDF Presidential candidate Sajith Premadasa.
A delegation of TELO held a discussion with Prime Minister Ranil Wickremesinghe earlier this week before arriving at the decision.
The UNP-led NDF has reiterated that the decision of the party has nothing to do with the 13 conditions put forward by Tamil parties before the election.
ITAK, the largest party in the TNA coalition, has also pledged support to Premadasa.